As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/claude-haiku-4-5/

# Claude Haiku 4.5

Anthropic, Claude 4 family. Status: legacy. Type: reasoning model. Released: 2025-10-15. Training cutoff: 2025-02.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Anthropic API (Claude API) | `claude-haiku-4-5-20251001` (alias `claude-haiku-4-5`) | https://api.anthropic.com/v1/messages | https://platform.claude.com/docs/en/models/haiku-4-5/overview |
| AWS Bedrock (Messages API / Mantle) | `anthropic.claude-haiku-4-5` |  | https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock |
| AWS Bedrock (InvokeModel) | `anthropic.claude-haiku-4-5-20251001-v1:0` |  | https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy |
| Google Cloud Vertex AI | `claude-haiku-4-5@20251001` |  | https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai |
| Microsoft Foundry (Azure) | `claude-haiku-4-5` |  | https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry |
| Claude Platform on AWS | `claude-haiku-4-5` |  | https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws |
| OpenRouter | `anthropic/claude-haiku-4.5` |  | https://openrouter.ai/anthropic/claude-haiku-4.5 |
| Web app |  |  | https://claude.ai |

## Pricing

- Input: $1 per 1M tokens
- Output: $5 per 1M tokens
- Cache read: $0.10 per 1M tokens
- Unit as published: per 1M tokens (USD); Batch API 50% off
- Source: https://platform.claude.com/docs/en/about-claude/pricing
- Last checked: 2026-10-08

## Specs

- Input: text, image, pdf
- Output: text
- Context window: 200,000 tokens
- Max output: 64,000 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- Published training cutoff: 2025-02 (February 2025).
- AI events after it on Post-Cutoff: 2,030 (473 major, 90 historic), as of 2026-11-13.
- Already missing at launch: 40.
- Briefings of the news since February 2025: https://postcutoff.com/briefings/cutoff-2025-02-s.md (short), https://postcutoff.com/briefings/cutoff-2025-02-m.md (medium), https://postcutoff.com/briefings/cutoff-2025-02.md (full).
- Its card, with five things it has never heard of: https://postcutoff.com/you/claude-haiku-4-5/

## What stands out

- Sonnet-4-class coding at Haiku price: 73.3% on SWE-bench Verified, roughly matching Sonnet 4 at one-third the cost and over 2x the speed. Source: https://www.anthropic.com/news/claude-haiku-4-5
- Sub-agent workhorse: Reaches about 90% of Sonnet 4.5 on Augment's agentic eval; Anthropic positions it for multi-agent orchestration. Source: https://www.anthropic.com/news/claude-haiku-4-5
- Haiku with extended thinking and computer use (first): First Haiku model with extended thinking; it also surpasses Sonnet 4 on some computer-use tasks. Source: https://www.anthropic.com/news/claude-haiku-4-5

## Notes

Legacy since Claude Haiku 5.5 (Oct 7, 2026), which is 90% cheaper; still available. Snapshot claude-haiku-4-5-20251001 (alias claude-haiku-4-5). Uses extended thinking (thinking type enabled + budget_tokens), no effort parameter. Training data cutoff Jul 2025. Retirement not sooner than 2026-10-15. Batch $0.50/$2.50.

Cheap, low-latency model for classification, extraction, sub-agents and high-volume chat.

```bash
curl https://api.anthropic.com/v1/messages \
 -H "x-api-key: $ANTHROPIC_API_KEY" -H "anthropic-version: 2023-06-01" -H "content-type: application/json" \
 -d '{"model":"claude-haiku-4-5","max_tokens":16000,"messages":[{"role":"user","content":"Hello"}]}'
```

Sources:
- Model page: https://platform.claude.com/docs/en/models/haiku-4-5/overview
- Announcement: https://www.anthropic.com/news/claude-haiku-4-5
- Pricing: https://platform.claude.com/docs/en/about-claude/pricing
- Models overview: https://platform.claude.com/docs/en/about-claude/models/overview
- Deprecations: https://platform.claude.com/docs/en/about-claude/model-deprecations

Model page: https://postcutoff.com/m/claude-haiku-4-5/